Why is contrast used in CT scan?(a) To suppress particular tissues(b) To enhance a particular tissue(c) To ensure correct tissue is being imaged(d) To reduce bone interferenceThis question was addressed to me in examination.This intriguing question originated from Computerized Axial Tomography in section Diagnostic Investigation via Imaging Techniques of Clinical Science

Why is contrast used in CT scan?(a) To suppress particular tissues(b)

1.	Why is contrast used in CT scan?(a) To suppress particular tissues(b) To enhance a particular tissue(c) To ensure correct tissue is being imaged(d) To reduce bone interferenceThis question was addressed to me in examination.This intriguing question originated from Computerized Axial Tomography in section Diagnostic Investigation via Imaging Techniques of Clinical Science
Answer» Right answer is (b) To enhance a particular tissue Easiest explanation: The contrasts are usually of iodine BASED and get absorbed by the body. They weaken the radiation passing through the area of interest making white PATCHES turn up. These white PATCHED actually represent a tumour that was not seen previously or a patch of diseased cells.Basically, they enhance the image by weakening the AMOUNT of radiation passing through.

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